Process for the production of a coating composition



UNITED STATES PATENT OFFICE PROCESS FOR THE PRODUCTION OF A COATING COMPOSITION Siegfried Pfeiffer, Riehen, near Basel, Switzerland, assignor to the firm J. R. Geigy A. G., Basel, Switzerland No Drawing. Application April 14, 1938, Serial NO. 202,131 In Switzerland April 21, 1937 6 Claims. (Cl. 260-735) This invention relates to a process for the red film with the above mentioned properties is production of a coating composition and is parobtained. ticularly concerned with coating mediums or p e 3 varnishes havinga chlorinated rubber basis. One p rts of c in ted rubber p r With a of the objects of the invention is to provide a chlorine content of 66% are dissolved in 75 parts 5 coating composition having improved properti s of a solvent mixture 1:1 of chlorobenzen-xylol. compared with chlorinated rubber varnishes of f er dissolving the Powder there are added in usual composition. suitable mixing apparatus 20 parts of finely According to this invention sulphuretted ground DOIYChIOmiIIB e 20 p ts o aluminum 10 products of p-methyl substituted anilines are bronze, 5 parts of a Softening agent Such as 10 mixed with chlorinated rubber in the presence esyl Phosphate and 5 Parts of linseed Oil boiled of a solvent. The sulphuretted products in quesin the presence of litharge and the Whole is tion are mainly the reaction products of sulphur formed into a hfllmogeneous 4 i o on p-toluidine and of sulphur on m-xylidine, 1. e. applying this mlxiure a film 1S Obtamed Whmh dehydro thig p toluidme and dehydmtmo m presents especial advantages as under-water yfidine which can be used in fo f paint. Its reslstance, especially to sea water, is minuted raw products the s0 ca11ed po1ychm excellent. NO formation of blisters nor the slightmine melt, or purified est swelling is Observed.

Coatings with such mixtures exhibit the ad- Example 4 vantage of considerably increased resistance to lyes and salt solutions, especially sea water. Their fastness to weather influences is also excellent.

By heating the mixtures, consisting of chlo- 20 parts of chlorinated rubber powder with a chlorine content of 60% are dissolved in 25 parts of a solvent mixture of chlorobenzene and tetralin. To the resulting highly viscous mass are added 25 20 parts of polychromine melt, 20 parts of ther- 25 g a g? q gi g and sulphugetfited max or gas soot and 8 parts of a softener and 9 9 m l e or m-Xy 1 me Su 5 the whole is mixed in suitable mixing apparatus tial additional increase of the fastness to Water to a unifurm paste Then a further 50 parts of and weather influences of the coatings obtainable the above mentiond solvent mixture are added.

can be produced especially m the case of the before use the desired spreading capacity is ad- 30 transparent justed by further cutting up.

Example 1 With 109 parts of chlorinated rubber solution, containing 25 parts of chlorinated rubber powder 20 parts the pulverised dehydrwthiO-P- with a 60% content of chlorine, and '75 parts Of toluidine and 10 parts of thermax or gas soot or 35 chlorobenzene as solvent, are admixed 40 parts graphite, are ground as finely as possible by of polychromine melt (see Col. Index No. 812) means of Suitable mixing apparatus Then 100 in the homogenizer, and finally there are added parts of a chlorinated rubber solution, contain- 5 parts of a oft ing agent, as f r example ing 25 parts of chlorinated rubber powder with 40 methyl adipic acid methylhexaline ester. Acoata o e Content 0'f and '75 parts of a 40 mg with this mixture produces a m with good solvent mixture consisting of chlorobenzeneadhesion to -m and which is particularly toluol-sangajol, are added and the Whole is mixed Example 5 sistant to lyes, salts, benzene and the like. in the homogenizer- After Gad-mg or Spraying a grey film is formed of remarkable resistance Example 2 to the above mentioned agents. 45

With 25 parts of chlorinated rubber powder with a chlorine content of about 66% there are admixed in the homogenizer 35 parts of finely 100 parts of a chlorinated rubber solution in ground dehydro-thio-m-xylidine, '7 parts of a pigchlorobenzene of about 25% strength are mainment dyestufi of the constitution m-nitro-ptained with 0.15 part of a polychromine melt for 50 toluidine-azo- 8-naphtho1, 8 parts of a softening a number of hours at 80-90 C. There occurs agent and with the addition of '75 parts of a an increase of the viscosity which is combined solvent such as xylol-toluol in equal parts, the with a deepening of the colour shade. With whole is mixed up into a solution ready for these solutions transparent films are Obtained,

spreading. On applying this colour mixture a which in contrast to the usual transparent chlo- 55 Example 6 rinated rubber films have a considerably increased resistance to weather and water;

What I claim is:

1. In the manufacture of coating compositions on the basis of chlorinated rubber and organic solvents, the step of admixing the said substances with a compound selected from the group consisting of sulphuretted p-toluidine and sulphuretted m-xylidine.

2. A coating composition on the basis'of ch10- rinated rubber dissolved in organic solvents of the character described containing as its essential ingredient a compound selected from the group consisting of dehydrothio-p-toluidine and dehydrothio-m-m lidine.

3. A coating composition of chlorinated rubber in organic solvents of the character described containing as its essential ingredient dehydro by melting sulphur and p-toluidine, gas soot and 15 methyl adipic acid methylhexaline ester.

SIEGFRIED PFEIFFER. 

